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powerpc fixes for 5.2 #3

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A minor fix to our IMC PMU code to print a less confusing error message when the
 driver can't initialise properly.
 
 A fix for a bug where a user requesting an unsupported branch sampling filter
 can corrupt PMU state, preventing the PMU from counting properly.
 
 And finally a fix for a bug in our support for kexec_file_load(), which
 prevented loading a kernel and initramfs. Most versions of kexec don't yet use
 kexec_file_load().
 
 Thanks to:
   Anju T Sudhakar, Dave Young, Madhavan Srinivasan, Ravi Bangoria, Thiago Jung
   Bauermann.
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Merge tag 'powerpc-5.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "A minor fix to our IMC PMU code to print a less confusing error
  message when the driver can't initialise properly.

  A fix for a bug where a user requesting an unsupported branch sampling
  filter can corrupt PMU state, preventing the PMU from counting
  properly.

  And finally a fix for a bug in our support for kexec_file_load(),
  which prevented loading a kernel and initramfs. Most versions of kexec
  don't yet use kexec_file_load().

  Thanks to: Anju T Sudhakar, Dave Young, Madhavan Srinivasan, Ravi
  Bangoria, Thiago Jung Bauermann"

* tag 'powerpc-5.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/kexec: Fix loading of kernel + initramfs with kexec_file_load()
  powerpc/perf: Fix MMCRA corruption by bhrb_filter
  powerpc/powernv: Return for invalid IMC domain
This commit is contained in:
Linus Torvalds 2019-06-02 10:21:04 -07:00
commit 460b48a0fe
5 changed files with 19 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/powerpc/kernel/kexec_elf_64.c
View File

@ -547,6 +547,7 @@ static int elf_exec_load(struct kimage *image, struct elfhdr *ehdr,
kbuf.memsz = phdr->p_memsz;
kbuf.buf_align = phdr->p_align;
kbuf.buf_min = phdr->p_paddr + base;
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
ret = kexec_add_buffer(&kbuf);
if (ret)
goto out;
@ -581,7 +582,8 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
struct kexec_buf kbuf = { .image = image, .buf_min = 0,
.buf_max = ppc64_rma_size };
struct kexec_buf pbuf = { .image = image, .buf_min = 0,
.buf_max = ppc64_rma_size, .top_down = true };
.buf_max = ppc64_rma_size, .top_down = true,
.mem = KEXEC_BUF_MEM_UNKNOWN };
ret = build_elf_exec_info(kernel_buf, kernel_len, &ehdr, &elf_info);
if (ret)
@ -606,6 +608,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
kbuf.bufsz = kbuf.memsz = initrd_len;
kbuf.buf_align = PAGE_SIZE;
kbuf.top_down = false;
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
ret = kexec_add_buffer(&kbuf);
if (ret)
goto out;
@ -638,6 +641,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
kbuf.bufsz = kbuf.memsz = fdt_size;
kbuf.buf_align = PAGE_SIZE;
kbuf.top_down = true;
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
ret = kexec_add_buffer(&kbuf);
if (ret)
goto out;

6
arch/powerpc/perf/core-book3s.c
View File

@ -1846,6 +1846,7 @@ static int power_pmu_event_init(struct perf_event *event)
int n;
int err;
struct cpu_hw_events *cpuhw;
u64 bhrb_filter;
if (!ppmu)
return -ENOENT;
@ -1951,13 +1952,14 @@ static int power_pmu_event_init(struct perf_event *event)
err = power_check_constraints(cpuhw, events, cflags, n + 1);
if (has_branch_stack(event)) {
cpuhw->bhrb_filter = ppmu->bhrb_filter_map(
bhrb_filter = ppmu->bhrb_filter_map(
event->attr.branch_sample_type);
if (cpuhw->bhrb_filter == -1) {
if (bhrb_filter == -1) {
put_cpu_var(cpu_hw_events);
return -EOPNOTSUPP;
}
cpuhw->bhrb_filter = bhrb_filter;
}
put_cpu_var(cpu_hw_events);

3
arch/powerpc/perf/power8-pmu.c
View File

@ -25,6 +25,7 @@ enum {
#define POWER8_MMCRA_IFM1 0x0000000040000000UL
#define POWER8_MMCRA_IFM2 0x0000000080000000UL
#define POWER8_MMCRA_IFM3 0x00000000C0000000UL
#define POWER8_MMCRA_BHRB_MASK 0x00000000C0000000UL
/*
* Raw event encoding for PowerISA v2.07 (Power8):
@ -239,6 +240,8 @@ static u64 power8_bhrb_filter_map(u64 branch_sample_type)
static void power8_config_bhrb(u64 pmu_bhrb_filter)
{
pmu_bhrb_filter &= POWER8_MMCRA_BHRB_MASK;
/* Enable BHRB filter in PMU */
mtspr(SPRN_MMCRA, (mfspr(SPRN_MMCRA) | pmu_bhrb_filter));
}

3
arch/powerpc/perf/power9-pmu.c
View File

@ -88,6 +88,7 @@ enum {
#define POWER9_MMCRA_IFM1 0x0000000040000000UL
#define POWER9_MMCRA_IFM2 0x0000000080000000UL
#define POWER9_MMCRA_IFM3 0x00000000C0000000UL
#define POWER9_MMCRA_BHRB_MASK 0x00000000C0000000UL
/* Nasty Power9 specific hack */
#define PVR_POWER9_CUMULUS 0x00002000
@ -296,6 +297,8 @@ static u64 power9_bhrb_filter_map(u64 branch_sample_type)
static void power9_config_bhrb(u64 pmu_bhrb_filter)
{
pmu_bhrb_filter &= POWER9_MMCRA_BHRB_MASK;
/* Enable BHRB filter in PMU */
mtspr(SPRN_MMCRA, (mfspr(SPRN_MMCRA) | pmu_bhrb_filter));
}

4
arch/powerpc/platforms/powernv/opal-imc.c
View File

@ -157,6 +157,10 @@ static int imc_pmu_create(struct device_node *parent, int pmu_index, int domain)
struct imc_pmu *pmu_ptr;
u32 offset;
/* Return for unknown domain */
if (domain < 0)
return -EINVAL;
/* memory for pmu */
pmu_ptr = kzalloc(sizeof(*pmu_ptr), GFP_KERNEL);
if (!pmu_ptr)